The very high resolution spectrometer at the National Institute of Standards and Technology

Morgan, H. D.; Fortna, J. D. E.; Seyoum, H. M.; Furst, Mitchell L.; Hughey, L. R.; Humm, D. C.; Asfaw, Araya

doi:10.1016/0168-9002(94)91894-5

Cited by 3 publications

(2 citation statements)

References 7 publications

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“…A 6.65 m spectrometer equipped with a focal plane scanner provided a resolving power of ϳ10 5 when 10 m entrance and exit slits were used. 30,31 N 2 , at pressures ranging from 5 to 12 Torr, was admitted to an 11.43 cm absorption cell mounted behind the spectrometer exit slit, with the transmitted EUV radiation detected at ϳ0.04 cm −1 intervals by a sodiumsalycilate-coated photomultiplier. Typical signal rates were ϳ3000 s −1 .…”

Section: B Euv Photoabsorption Spectroscopymentioning

confidence: 99%

Optical observation of the C, 3sσgF3, and 3pπuG3 Π3u states of N2

Lewis

Baldwin

Sprengers

et al. 2008

The Journal of Chemical Physics

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High-resolution laser-based one extreme-ultraviolet ͑EUV͒ + one UV two-photon ionization spectroscopy and EUV photoabsorption spectroscopy have been employed to study spin-forbidden 3 ⌸ u -X 1 ⌺ g + ͑v ,0͒ transitions in 14 N 2 and 15 N 2 . Levels of the C 3 ⌸ u valence and 3s g F 3 and 3p u G 3 3 ⌸ u Rydberg states are characterized, either through their direct optical observation, or, indirectly, through their perturbative effects on the 1 ⌸ u and 1 ⌺ u + states, which are accessible in dipole-allowed transitions. Optical observation of the G 3 -X͑0,0͒ and ͑1,0͒ transitions is reported for the first time, together with evidence for six new vibrational levels of the C state. Following the recent observation of the F 3 -X͑0,0͒ transition at rotational resolution ͓J. P. Sprengers et al., J. Chem. Phys. 123, 144315 ͑2005͔͒, the F 3 ͑v =1͒ level is found to be responsible for a local perturbation in the rotational predissociation pattern of the bЈ 1 ⌺ u + ͑v =4͒ state. Despite their somewhat fragmentary nature, these new observations provide a valuable database on the 3 ⌸ u states of N 2 and their interactions which will help elucidate the predissociation mechanisms for the nitrogen molecule.

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Section: B Euv Photoabsorption Spectroscopymentioning

confidence: 99%

Optical observation of the C, 3sσgF3, and 3pπuG3 Π3u states of N2

Lewis

Baldwin

Sprengers

et al. 2008

The Journal of Chemical Physics

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“…> 10 5 in the photon energy range 5± 40 eV. We chose to adopt an off-plane Eagle-type spectrometer because its high-resolution capability with a synchrotron radiation light source has already been proven at the Photon Factory (Ito et al, , 1989, at SURF II (Brown & Ginter, 1984;Morgan et al, 1994) and at the Advanced Light Source (Koike et al, 1994;Heimann et al, 1996).…”

Section: Basic Concept For Optical Designmentioning

confidence: 99%

High-flux and high-resolution spectroscopic facility in the VUV region at Super-ACO

Ito

Lagarde

Polack

et al. 1998

J Synchrotron Radiat

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A new spectroscopic facility, consisting of a planar/helical undulator and a 6.65 m off-plane Eagle monochromator, has been designed. It can supply high-¯ux and high-resolution photons with`exotic' polarization in the 5±40 eV energy range. The astigmatism can be compromised by horizontally focusing the incident radiation on the grating. The rotation of a postfocusing toroidal mirror compensates for the deviation of the exit beam caused by the grating translation. The whole system will be installed at beamline SU5 of SUPER-ACO (0.8 GeV) at the beginning of 1998. With a 4300 grooves mm À1 grating, a resolving power of around 10 5 is expected at 20 eV.

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Performance of the vacuum ultraviolet high-resolution and high-flux beamline for chemical dynamics studies at the Advanced Light Source

Heimann

Koike

Hsu

et al. 1997

Review of Scientific Instruments

188

114

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At the Advanced Light Source an undulator beamline, with an energy range from 6 to 30 eV, has been constructed for chemical dynamics experiments. The higher harmonics of the undulator are suppressed by a novel, windowless gas filter. In one branchline high-flux, 2% bandwidth radiation is directed toward an end station for photodissociation and crossed molecular-beam experiments. A photon flux of 10 16 photon/s has been measured at this end station. In a second branchline a 6.65 m off-plane Eagle monochromator delivers narrow bandwidth radiation to an end station for photoionoization studies. At this second end station a peak flux of 3 ϫ 10 11 was observed for 25 000 resolving power. This monochromator has achieved a resolving power of 70 000 using a 4800 grooves/mm grating, one of the highest resolving powers obtained by a vacuum ultraviolet monochromator.

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The very high resolution spectrometer at the National Institute of Standards and Technology

Cited by 3 publications

References 7 publications

Optical observation of the C, 3sσgF3, and 3pπuG3 Π3u states of N2

Optical observation of the C, 3sσgF3, and 3pπuG3 Π3u states of N2

High-flux and high-resolution spectroscopic facility in the VUV region at Super-ACO

Performance of the vacuum ultraviolet high-resolution and high-flux beamline for chemical dynamics studies at the Advanced Light Source

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